8th Grade Lab Science (Cribb & Duane)
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OBJECTIVES:  Students should be able to...

Define and identify the major concepts of the experimental design of an experiment

bullethypothesis
bulletdependent variable
bulletcontrol
bulletindependent variable
bulletconstants
bulletrepeated trials

 

bulletState a hypothesis that predicts what the relationship between the independent variable and the dependent variable is
bulletCreate an experimental design diagram
bulletWrite a scientific title.

 

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REFERENCE

Independent variable (IV): the variable that is purposefully changed by the experimenter.

Dependent variable (DV): the variable that responds.

Constants (C): all factors that remain the same and have a fixed value.

Control: the standard for comparing experimental effects

Repeated trials: the number of experimental repetitions, objects or organisms tested at each level of the independent variable.

Experimental Design Diagram: a diagram that summarizes the independent variable, the dependent variable, constants, control, number of repeated trials, experimental title, and hypothesis.

 

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CREATING EXPERIMENTAL DESIGN DIAGRAMS

Format the experimental process

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Begin by drawing a rectangle.

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Write the independent variable across the top of the rectangle.

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Divide the rectangle into labeled columns to represent the different levels of the independent variable.

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Identify your control.

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Indicate the number of trials in each column.

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Write the dependent variable beneath the rectangle.

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List the constants beneath the rectangle.

   

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WRITING SCIENTIFIC TITLES

              

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Write a statement that relates the independent variable to the dependent variable. 

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For example: The Affect of the ___________(IV) on the __________(DV).

 

 

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Handouts:

Activity: Paper Airplanes

Lab Activity: Hot Solutions

Guidelines: Experimental Design Diagrams & Titles

Worksheet: Experimental Design Diagrams

Template: Experimental Design Diagrams

Homework Scenarios: Design Detective